CATALOG OF ORIGINAL DESCRIPTIONS: Truncorotaloides rohri var. piparoensis Bronnimann & Bermudez 1953

This page provides data from the catalog of type descriptions. The catalog is sorted alphabetically. Use the current identification link to go back to the main database.


Higher levels: pf_cat -> T -> Truncorotaloides -> Truncorotaloides rohri piparoensis
Other pages this level: T. haynesi, T. libyaensis, T. rohri, T. rohri guaracaraensis, T. rohri mayoensis, T. rohri piparoensis

Truncorotaloides rohri piparoensis

Citation: Truncorotaloides rohri var. piparoensis Bronnimann & Bermudez 1953
Rank: Variety
Type locality: Duff Road area, near Kelly Junction, about 7 miles east of Pointe-a-Pierre, central Trinidad, B.W.I.
Type specimens: Plate 87, figs. 4-6; Holotype.-T.L.L. Cat. No. 172694
Type repository: Washington; USNM

Linked specimens: USNM-4234

Current identification/main database link: Acarinina rohri (Bronnimann & Bermudez 1953)


Original Description
The general outline of the low trochoidal test is lobate. The slightly convex spiral side shows two volutions with about eleven chambers. The adult test is five-chambered. The chambers are subglobular and appressed in the early stage; later chambers become subangular and flattened at the spiral side. In the adult, the straight sutures are deep and the chambers are well separated. The large arcuate apertures of the last two chambers open directly into the umbilicus. They are surrounded by minute lip-like borders. The spiral side shows four small additional arcuate openings with minute lip-like borders, at the intersections of radial and spiral sutures. The end chamber is pierced by two sutural openings. It is not known whether this type of opening is confined to the adult. The surface is uniformly spinose. The initial portion and the umbilical parts of the adult chambers are strongly spinose, whereas the spines are scarcer and smaller on the flattened surface of the last two chambers. The walls are finely perofrate. Four out of five well-preserved specimens are sinistrally coiled.

Size: Dimensions - Maximum diameter of test 0.387 mm. End chamber: Radial diameter 0.175 mm.; tangential diameter 0.250 mm.; height 0.275 mm. Diameter of aperture about 0.075 mm.

Etymology: named after Piparo River, central Trinidad.

Extra details from original publication
Discussion - The test is intermediate between the completely rounded variety Truncorotaloides rohri var. guaracaraensis Bronnimann and Bermudez and the central type, Truncorotaloides rohri. It differs from Truncorotaloides rohri guaracaraensis by the more lobate outline, the slightly subangular and spirally flattened adult chambers, and by the differentiation in the development of the spines. 

Found also at Jaruco, Province of Habana, Cuba; and at the type locality of the Guayabal formation, State of Vera Cruz, Mexico.

References:

Brönnimann, P. & Bermudez, P. J. (1953). Truncorotaloides, a new foraminiferal genus from the Eocene of Trinidad, B.W.I. Journal of Paleontology. 27: 817-820. gs


logo

Truncorotaloides rohri piparoensis compiled by the pforams@mikrotax project team viewed: 30-7-2021

Taxon Search:
Advanced Search

Short stable page link: https://mikrotax.org/pforams/index.php?id=132393 Go to Archive.is to create a permanent copy of this page - citation notes



Comments (0)

No comments yet on this page. Please do add comments if you spot any problems, or have information to share

Add Comment

* Required information
1000
Captcha Image
Powered by Commentics